is_resource
(PHP 4, PHP 5, PHP 7)
is_resource — Finds whether a variable is a resource
Description
bool is_resource ( mixed $var )Finds whether the given variable is a resource.
Parameters
var
The variable being evaluated.
Return Values
Returns TRUE if var is a resource, FALSE otherwise.
Examples
Example #1 is_resource() example
<?php
$db_link = @mysql_connect('localhost', 'mysql_user', 'mysql_pass');
if (!is_resource($db_link)) {
die('Can\'t connect : ' . mysql_error());
}
?>Notes
Note: is_resource() is not a strict type-checking method: it will return
FALSEifvaris a resource variable that has been closed.
See Also
- The resource-type documentation
- get_resource_type() - Returns the resource type
← is_real
is_scalar →
© 1997–2017 The PHP Documentation GroupLicensed under the Creative Commons Attribution License v3.0 or later.
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